Potentiostatic electrosynthesis of cerium conversion coatings on AA2024-T3 aircraft alloy in diammonium pentanitrocerate solutions

Volume 3, Issue 1, February 2018     |     PP. 10-36      |     PDF (1281 K)    |     Pub. Date: April 9, 2018
DOI:    297 Downloads     7459 Views  

Author(s)

S. Kozhukharov, Laboratory for Advanced Materials Research, University of Chemical Technology and Metallurgy, 8 Kl. Okhridsky blvd., 1756-Sofia, Bulgaria
Christian Girginov, Department of Chemical Sciences, University of Chemical Technology and Metallurgy, 8 Kl. Okhridsky blvd., 1756-Sofia, Bulgaria

Abstract
Cerium conversion coatings (CeCC) have been synthesized for corrosion protection of AA2024-T3 aircraft alloy through application of potentiostatic regime in aqueous solutions of diammonium pentanitrocerate - (NH4)2Ce(NO3)5. This cerium compound is used for first time for this purpose. The impact of the following deposition parameters: precursor solution concentration, the quantity of the H2O2 addition, the applied cathodic potential value, and the deposition duration on the deposition kinetics, the surface morphology, the microstructure, and the composition of the obtained coatings is investigated. At the initial stage, the process is diffusion controlled, and subsequently it becomes be controlled by the CeCC nucleation and growth rate, following the island like growth mechanism, typical for this alloy. It has been established that the coatings obtained from 0,03 М (NH4)2Ce(NO3)5 solutions, with Н2О2 addition in molar ratio between 2:1 and 4:1 in respect to Ce content, and applied potential Е = – 1,0 V for 360 s possess uniform morphology and good adherence to the substrate. These optimal conditions are confirmed by quantitative evaluation of the coating roughness using Atomic Force Microscopy (AFM). The investigations, performed by Scanning Electron Microscopy (SEM), Energy Dispersion and Photoelectron Spectroscopy methods (EDS) and (XPS) reveal that the coatings possess net like structure (type «dry land»), being a mixture of Се(III) and Ce(IV) oxides. The best coatings elaborated reach total Cerium content superior to 57 %wt, with Ce(IV) to Ce(III) relation equal to 85 : 15wt. %.

Keywords
AA2024-T3 Alloy; Rare earth elements; Electrodepositited films; AFM; SEM; XPS.

Cite this paper
S. Kozhukharov, Christian Girginov, Potentiostatic electrosynthesis of cerium conversion coatings on AA2024-T3 aircraft alloy in diammonium pentanitrocerate solutions , SCIREA Journal of Materials. Volume 3, Issue 1, February 2018 | PP. 10-36.

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